Cimolodon is a genus of mammal from the Upper Cretaceous of North America. It was a member of the extinct order of Multituberculata within the suborder Cimolodonta and possibly the family Cimolodontidae. "Cimolodon seems to be more closely related to the Paracimexomys group than are other ptilodontoideans," (Kielan-Jaworowska & Hurum, 2001, p. 404). Odd as it may sound, the placement of this genus within Cimolodontidae is tentative. Its tooth enamel is gigantoprismatic, while its possible relatives favor a microprismatic style (p. 418 ibid.).